Application Layer Functionality and Protocols Network Fundamentals

Application Layer Functionality and Protocols Network Fundamentals – Chapter 3 Version 4. 0 © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 1

Objectives § Define the application layer as the source and destination of data for communication across networks. § Explain the role of protocols in supporting communication between server and client processes. § Describe the features, operation, and use of well-known TCP/IP application layer services (HTTP, DNS, SMTP). © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 2

Applications – The Interface Between Human and Data Networks § Explain that applications provide the means for generating and receiving data that can be transported on the network © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 3

Applications – The Interface Between Human and Data Networks § Explain the role of applications, services and protocols in converting communication to data that can be transferred across the data network © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 4

Applications – The Interface Between Human and Data Networks § Define the separate roles applications, services and protocols play in transporting data through networks © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 5

Applications – The Interface Between Human and Data Networks § Describe the role protocols play in networking and be able to identify several message properties that can be defined by a protocol © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 6

The Role of Protocols in Supporting Communication § Describe the roles of client and server processes in data networks © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 7

The Role of Protocols in Supporting Communication § List common Application Layers services and protocols © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 8

The Role of Protocols in Supporting Communication § Compare and contrast client server networking with peer-to-peer networking and peer-to-peer applications © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 9

Features, Operation, and Use of TCP/IP Application Layer Services § Describe the features of the DNS protocol and how this protocol supports DNS services © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 10

Features, Operation, and Use of TCP/IP Application Layer Services § Describe the features of the HTTP protocol and how this protocol supports the delivery of web pages to the client © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 11

Features, Operation, and Use of TCP/IP Application Layer Services § Describe the features of the POP and SMTP protocols, and how these protocols support e-mail services © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 12

Features, Operation, and Use of TCP/IP Application Layer Services § Describe the features of the Telnet protocol and identify several of its uses in examining and managing networks © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 13

Features, Operation, and Use of TCP/IP Application Layer Services § Describe the features of the SMB protocol and the role it plays in supporting file sharing in Microsoft-based networks © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 14

Features, Operation, and Use of TCP/IP Application Layer Services § Describe the features of the Gnutella protocol and the role it plays in supporting P 2 P services © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 15

Summary © 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 16

© 2007 Cisco Systems, Inc. All rights reserved. Cisco Public 17